EP4163099B1 - Polstermaterial zum heisspressen - Google Patents

Polstermaterial zum heisspressen

Info

Publication number
EP4163099B1
EP4163099B1 EP21817672.5A EP21817672A EP4163099B1 EP 4163099 B1 EP4163099 B1 EP 4163099B1 EP 21817672 A EP21817672 A EP 21817672A EP 4163099 B1 EP4163099 B1 EP 4163099B1
Authority
EP
European Patent Office
Prior art keywords
cushion
hot pressing
comparative example
woven fabric
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP21817672.5A
Other languages
English (en)
French (fr)
Other versions
EP4163099A1 (de
EP4163099C0 (de
EP4163099A4 (de
Inventor
Takamitsu Ozeki
Akira Yoshida
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yamauchi Corp
Original Assignee
Yamauchi Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yamauchi Corp filed Critical Yamauchi Corp
Publication of EP4163099A1 publication Critical patent/EP4163099A1/de
Publication of EP4163099A4 publication Critical patent/EP4163099A4/de
Application granted granted Critical
Publication of EP4163099C0 publication Critical patent/EP4163099C0/de
Publication of EP4163099B1 publication Critical patent/EP4163099B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/34—Feeding the material to the mould or the compression means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B30B15/061—Cushion plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/024—Woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B32B5/262—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary characterised by one fibrous or filamentary layer being a woven fabric layer
    • B32B5/263—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary characterised by one fibrous or filamentary layer being a woven fabric layer next to one or more woven fabric layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
    • C03C25/10—Coating
    • C03C25/24—Coatings containing organic materials
    • C03C25/26—Macromolecular compounds or prepolymers
    • C03C25/32—Macromolecular compounds or prepolymers obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00—Woven fabrics designed to make specified articles
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00—Woven fabrics designed to make specified articles
    • D03D1/0082—Fabrics for printed circuit boards
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D11/00—Double or multi-ply fabrics not otherwise provided for
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D13/00—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft
    • D03D13/004—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft with weave pattern being non-standard or providing special effects
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
    • D03D15/242—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads inorganic, e.g. basalt
    • D03D15/267—Glass
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/40—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads
    • D03D15/49—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads textured; curled; crimped
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D7/00—Woven fabrics designed to be resilient, i.e. to recover from compressive stress
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/59—Polyamides; Polyimides
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
    • D06N3/125—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C2043/3205—Particular pressure exerting means for making definite articles
    • B29C2043/3216—Particular pressure exerting means for making definite articles deformable nets, meshes, lattices or fabrics, e.g. tubular ones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/02—Composition of the impregnated, bonded or embedded layer
    • B32B2260/021—Fibrous or filamentary layer
    • B32B2260/023—Two or more layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/04—Impregnation, embedding, or binder material
    • B32B2260/046—Synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/101—Glass fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/56—Damping, energy absorption
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
    • D06M2101/16—Synthetic fibres, other than mineral fibres
    • D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M2101/34—Polyamides
    • D06M2101/36—Aromatic polyamides
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00—Industrial

Definitions

  • the present invention relates to a cushion material for hot pressing.
  • a printed circuit board such as a copper-clad laminate, a flexible printed circuit board, and a multilayer board, an IC card, a liquid crystal display board, and a ceramic laminate (hereinafter, collectively referred to as "laminate")
  • laminate a ceramic laminate
  • Typical properties that the cushion materials 11 are required to have include cushioning properties for absorbing unevenness of the heating platens 13 and the workpiece 12 to be pressed, in-plane uniformity for transmitting temperature and pressure from the heating platens 13 to the workpiece 12 to be pressed uniformly within the entire press plane, heat transfer properties for transferring heat from the heating platens 13 to the workpiece 12 to be pressed efficiently, heat resistance for resisting pressing temperature, and the like.
  • Patent Document 1 discloses a cushion material 1 for hot pressing that is made of woven fabric and rubber impregnated into the woven fabric and includes a fiber-rubber composite material layer having pores therein.
  • the fifth generation mobile telecommunications system (hereinafter, referred to as "5G") has been in the limelight due to having advantages such as Enhanced Mobile Broadband (eMBB), Ultra-Reliable and Low Latency Communications (URLLC), and massive Machine Type Communication (mMTC).
  • eMBB Enhanced Mobile Broadband
  • URLLC Ultra-Reliable and Low Latency Communications
  • mMTC massive Machine Type Communication
  • Patent Document 1 WO 2008/065969
  • WO 2012/169011 A1 it is described a surface layer material for sheet-like cushion material arranged on surface layer of cushion material for hot press, and a resin layer which is arranged on one surface side of the surface layer material and covers one surface of the surface layer material; and a resin layer which is disposed on one surface side of the surface layer material and covers one surface of the surface layer material, a rubber layer arranged on the other surface side of the surface layer material and covering the other surface of the surface layer material, and a woven fabric layer arranged between the resin layer and the rubber layer and using a bulky yarn on at least one of warp and weft.
  • the woven fabric layer is provided on the resin layer side, and is provided with a woven fabric-resin composite layer formed by impregnating a part of the woven fabric with a resin constituting the resin layer, and a woven fabric-rubber composite layer provided on the rubber layer side and formed by impregnating a part of the woven fabric with rubber constituting the rubber layer.
  • the surface layer material for the cushion material is provided with a gap inside the woven fabric layer.
  • the resin is preferably a mixture of one or more resins selected from the group consisting of fluororesin, phenol resin, melamine resin, epoxy resin, unsaturated polyester resin, silicone resin, polyimide resin, thermosetting acrylic resin, furan resin, urea oil and fat, diallyl phthalate resin, and polyurethane resin.
  • WO 2004/103691 A1 relates to a sheet for thermal pressing, which comprises a base material in a sheet form and a releasing coating film formed on the surface of the base material, wherein the coating film comprises, as a parent material, a resin composition having 5 to 55 mass % of an organic powder and 5 to 55 mass % of an inorganic powder both relative to 100 mass % of the resin composition, incorporated therein, with the proviso that the sum of the percentages of the powders is 30 to 60 mass %.
  • the coating film perfectly covers the base material and imparts gas tightness to the sheet for thermal pressing.
  • a resin such as a fluoro resin, a phenol resin, a melamine resin, an epoxy resin, an unsaturated polyester resin, a silicone resin, a polyimide resin, a thermosetting acrylic resin, a furan resin, a urea resin, a diallyl phthalate resin, a polyurethane resin and the like is used as a single, a blend or a copolymer; especially, the polyimide resin and the fluoro resin are preferable.
  • Patent Document 1 since the cushion material for pressing disclosed in Patent Document 1 is impregnated with rubber, when the cushion material is used in pressing at a high temperature of 280°C or more, the cushion material deteriorates in an early stage, causing decrease in physical properties such as cushioning properties, separation between layers, and the like.
  • An objective of the present invention is to provide a cushion material for hot pressing that can maintain good cushioning properties even when used in high-temperature pressing at 280°C or more repeatedly.
  • the present inventors conducted studies about materials combining cushioning properties and heat resistance, which are alternatives to rubber. In the course of selecting material excellent in heat resistance, the present inventors paid attention to resins such as polyimide resin. However, the present inventors expected that the polyimide resin would be inappropriate for a cushion material because a hardness of polyimide is 100 in terms of type A durometer hardness and 78 in terms of type D durometer hardness, which meant that the polyimide resin is a hard material compared with fluoro rubber (type A durometer hardness: 50 to 95, type D durometer hardness: 20 to 40).
  • the present inventors conducted various studies and found, unexpectedly, that it is possible to provide good cushioning properties in a case where polyimide resin is caused to be adhered to surfaces of fibers forming woven fabric for which glass fiber texturized yarns are used as its warp and/or weft, by which the present inventors completed the present invention.
  • the present invention is based on such findings, and the present invention is "a cushion material for hot pressing including a cushion layer, wherein the cushion layer includes woven fabric formed by fibers and polyimide resin adhered to the surfaces of the fibers forming the woven fabric and has pores in the cushion layer, and warp and/or weft of the woven fabric is texturized yarns made of glass fiber".
  • the present invention it is possible to provide a cushion material for hot pressing that can maintain good cushioning properties even when used in high-temperature pressing at 280°C or more repeatedly.
  • Figure 1 illustrates a cushion material 10 for hot pressing according to the present embodiment.
  • the cushion material 10 for hot pressing according to the present embodiment includes at least a cushion layer 1.
  • the cushion layer 1 is a sheet-like cushion member (cushion sheet) including woven fabric 5 and polyimide resin 6 that is adhered to surfaces of fibers forming the woven fabric 5.
  • the cushion layer 1 has pores 7 therein.
  • warp 5a and/or weft 5b of the woven fabric 5 is texturized yarn made of glass fiber.
  • the warp 5a is twisted yarn made of glass fiber and the weft 5b is the texturized yarn made of glass fiber.
  • the cushion material 10 for hot pressing according to the present embodiment includes such a cushion layer 1, the cushion material 10 can maintain good cushioning properties even when used in high temperature pressing at 280°C or more repeatedly.
  • a texturized yarn made of glass fiber is used as a fiber for forming the woven fabric 5 of the cushion layer 1.
  • the texturized yarn made of glass fiber is a yarn that has a large occupancy area and in which short fibers forming the glass yarn are not parallel to one another but are pulled while tangled up untidily.
  • the texturized yarn has a swell like a woolen yarn, and a woven fabric made of texturized yarns has many pores therein unlike typical woven fabrics.
  • the cushion layer 1 is a sheet-like article. If a thickness of the cushion layer 1 is too small, the cushion layer 1 may have poor cushioning properties, and if the thickness is too large, the cushioning part 1 may have poor heat transfer properties. Thus, an appropriate thickness of the cushion layer 1 is preferably within the range of 0.5 to 5.0 mm, which however depends on a usage of the cushion layer 1. In a case where two or more cushion layers 1 are to be stacked and used, a total thickness of the cushion layers 1 is preferably within the range of 0.5 to 5.0 mm.
  • the polyimide resin 6 is adhered to the surfaces of the fibers forming the woven fabric 5.
  • the polyimide resin 6 moderately penetrates into pores 7 included in the texturized yarn and pores 7 between the yarns but does not close the pores 7 completely, and thus pores 7 remain in the cushion layer 1. Therefore, the cushion material 10 for hot pressing according to the present embodiment exerts good cushioning properties.
  • the cushion material 10 includes the texturized yarns woven therein and has a woven fabric shape, the cushion material 10 is good in basis weight accuracy and excellent in in-plane uniformity compared with nonwoven fabric.
  • the cushion material 10 has the woven fabric shape, the thickness of the cushion material 10 can be made to be smaller than that of nonwoven fabric and can be made to be excellent in heat transfer properties.
  • Glass fiber has heat resistance and thus is less susceptible to dimensional change by heat; therefore, a cushion material for hot pressing including glass fiber is good in dimensional stability even when used in high temperature pressing at 280°C or more repeatedly.
  • the polyimide resin 6 adhered to the surfaces of the fibers forming the woven fabric 5 protects the glass fibers and connects contacts between the fibers (the contacts including contacts between the warp and the weft as well as contacts between filament fibers forming the texturized yarns). Therefore, the cushion material 10 for hot pressing according to the present embodiment can reduce breakage of the glass fibers when used in hot pressing repeatedly, can restrain permanent set in fatigue of the woven fabric 5, and thus can maintain good cushioning properties. That is, the cushion material 10 is excellent in durability.
  • the polyimide resin 6 is preferably a resin that has a decomposition temperature (temperature at weight loss of 5%) and a glass transition temperature more than a pressing temperature (280°C or more).
  • a polyimide resin having a decomposition temperature and a glass transition temperature that are both 400°C or more is preferable to use.
  • Figure 2 illustrates a texturized yarn (bulked yarn) 1a made of glass fibers.
  • Figure 3 illustrates a typical glass fiber yarn (single yarn or twisted yarn) 1b.
  • the bulked yarn 1a is a textured yarn that is made to have a swell like a woolen yarn by opening a single yarn or swelling a twisted yarn. Having many pores in itself, the bulked yarn 1a can be impregnated with resin moderately.
  • As texturized yarns in addition to bulked yarns, staple yarns and sliver yarns are available. The staple yarns are obtained by spinning cotton-like glass short fibers into yarns.
  • the sliver yarns are yarns obtained by twisting untwisted bulky short fibers (slivers).
  • a woven fabric including bulked yarns 1b made of glass fiber for example, A305, A330, A400, A415, A450, A500, T330, T540, T790, T860, and T900 from UNITIKA LTD., KS4010, KS4155, and KS4325 from Nitto Boseki Co., Ltd., and the like are commercially available.
  • the woven fabric 5 of the cushion layer 1 may be a woven fabric that is woven from texturized yarns 1a used as one of its warp 5a and its weft 5b and normal glass fiber yarns 1b used as the other, or a woven fabric that is woven from texturized yarns 1a as both of its warp 5a and weft 5b.
  • texturized yarns 1a are used as one of the warp 5a and the weft 5b
  • normal glass fiber yarns (single yarns or twisted yarns) 1b can be used as the other.
  • the woven fabric 5 is preferably single weave or double weave.
  • the woven fabric 5 is triple weave or more than triple weave, the woven fabric 5 becomes too thick, its degree of loss of elasticity may be high, and its heat transfer properties may deteriorate. There is also a case where penetration of the polyimide resin 6 that is impregnated into the woven fabric 5 to be adhered to the surfaces of the fibers forming the woven fabric 5 may be insufficient. Note that basis weight accuracy and porous properties of the woven fabric can be adjusted by selecting a yarn count, a weave density, a weaving method, or the like as appropriate.
  • the cushion layer 1 needs to include adequate pores 7.
  • a porosity of the cushion layer 1 may be difficult to grasp exactly by a method such as cross-section observation.
  • the present inventors conducted intensive studies about how to evaluate the porosity of the cushion layer 1 and found that the porosity can be estimated from a result of a test conducted through the following procedure.
  • t 0 a thickness of the cushion material 10 for hot pressing
  • t 1 a thickness of the cushion material 10 for hot pressing when the cushion material 10 for hot pressing is compressed under the following pressing test conditions
  • an amount of pores per unit volume can be estimated from a calculated value of "(t 0 - t 1 )”.
  • This "(t 0 - t 1 )" can be regarded as the amount of pores of the cushion layer 1 because a major part that has the pores 7 and is compressively deformed is the cushion layer 1 among members constituting the cushion material 10 for hot pressing (in addition to the cushion layer 1, surface layers 2, bonding layers 3, a bonding sheet part 4, etc. described later).
  • a porosity Fn of the cushion layer 1 can be estimated from a calculated value of "(t 0 - t 1 ) / t 2 ". That is, when the cushion material 10 for hot pressing is compressed by an applied pressure of 10 MPa under a temperature environment at 25°C, most of the pores 7 that are present in the cushion layer 1 of the cushion material 10 for hot pressing are crushed, and thus this value can be considered to be a value that corresponds to the porosity, namely a pseudo porosity.
  • the thickness t 0 of the cushion material 10 for hot pressing can be measured with, for example, a dial thickness gauge, a digital microscope, or the like.
  • the thickness t 1 when the cushion material 10 for hot pressing is compressed under the following pressing test conditions can be measured with a testing machine having a compression function such as Instron universal material testing machine (from Instron (R)) and AUTOGRAPH precision universal testing machine (from Shimadzu Corporation).
  • the thickness t 2 of the cushion layer 1 used in the cushion material 10 for hot pressing is a thickness of a woven fabric 5 that is made of glass fiber in which texturized yarns are used as its warp 5a and/or its weft 5b.
  • a sample in a form of an about 2.5 cm square is taken from the cushion material 10 for hot pressing along a thread of warp 5a and a thread of weft 5b of woven fabric forming the cushion layer 1, a cross section of the sample is observed at 20 to 100x magnification under a digital microscope, and a measurement tool is used to measure a distance (h illustrated in Figure 1 ) between a line that connects two apexes of a fiber (a thread of warp 5a or weft 5b) meandering along the cross section of the cushion layer 1 that are positioned at an upper edge of the cushion layer 1 (a line that connects bending points A1 and A2 of the thread of warp 5a in the example illustrated in Figure 1 ) and a line that connects two apexes of the fiber that are positioned at a lower edge of the cushion layer 1 (a line that connects bending points B1 and B2 of the thread of weft 5b in the example illustrated in Figure 1 ).
  • the measurement is performed at a spot near a center portion of each side of the sample, and an average value of the measurement at the four spots is determined to be a value of the measurement.
  • a thickness of each layer is measured, and a total of the thicknesses is determined to be the thickness t 2 of the cushion layer 1.
  • the cushion material 10 for hot pressing is typically in a quadrilateral plate shape each side of which is 20 cm to 250 cm long.
  • the sample for the measurement should be taken from a location for which in-plane variations are taken into consideration as much as possible.
  • four locations in total that are in vicinities of midpoints of lines connecting four corners and a center of the cushion material 10 for hot pressing are determined as locations for taking samples (2.5 cm square) for the measurement, and an average value of the measurement at the four locations is determined as its porosity.
  • one location at a position 5 cm or more away from an edge is determined as a location for taking a sample (2.5 cm square) for the measurement.
  • a lower limit of Fn measured in this manner is preferably set at 0.20.
  • the lower limit of Fn is more preferably set at 0.25. It is only required that Fn is satisfied at least by an unused cushion material 10 for hot pressing. However, a value of Fn decreases as use of the cushion material 10 for hot pressing increases. That is, when a cushion material 10 for hot pressing used in pressing a plurality of times still has Fn being 0.20 or more, the cushion material 10 for hot pressing can maintain good cushioning properties. For example, it is preferable that a cushion material 10 for hot pressing once subjected to pressing under conditions of 300°C and 10 MPa still have Fn being 0.20 or more.
  • a cushion material 10 for hot pressing In a case of a cushion material 10 for hot pressing according to the present invention, its retention of cushioning properties is 79% or more even after the cushion material 10 for hot pressing is subjected to pressing 100 times under conditions of 4 MPa and 400°C, a relatively high temperature, which will be described in EXAMPLE. Therefore, even if usage conditions (pressing temperature, pressure, the number of times, etc.) of a used cushion material 10 for hot pressing are unknown when the used cushion material 10 for hot pressing is obtained, when its Fn is within the range of 0.10 or more, it is possible to estimate that the cushion material 10 for hot pressing had Fn being 0.20 or more when the cushion material 10 for hot pressing was still unused.
  • Fn No upper limit will be defined for Fn.
  • the upper limit is more preferably 0.45. Even if Fn of an unused cushion material 10 for hot pressing is more than 0.50, it is only required that Fn becomes 0.50 or less after a first pressing.
  • Fn described above can be managed with the same criterion in either a case where the cushion material 10 for hot pressing includes only the cushion layer 1 or a case where the cushion material 10 for hot pressing includes, in addition to the cushion layer 1, layers such as a bonding sheet part 4 and surface layers 2 on its surfaces with bonding layers 3 interposed therebetween.
  • the surface layers 2, the bonding layers 3, and the bonding sheet part 4 have few pores, and most of pores present in the cushion material 10 for hot pressing are present in the cushion layer 1.
  • a porosity of the cushion material 10 for hot pressing as a whole is substantially the same as a porosity of the cushion layer 1 alone.
  • a layer that is defined as a cushion layer 1 satisfies a condition that a base material of the layer is a woven fabric 5 that is made of glass fiber and in which texturized yarns are used as its warp 5a and/or its weft 5b, with the polyimide resin 6 being adhered to surfaces of fibers forming the woven fabric 5, and the layer has pores 7. Therefore, even a bonding sheet part 4, a bonding layer 3, and a surface layer 2 satisfying such condition are each regarded as a cushion layer 1.
  • a layer that does not satisfy the condition that a base material of the layer is a woven fabric 5 that is made of glass fiber and in which texturized yarns are used as its warp 5a and/or its weft 5b, with the polyimide resin 6 being adhered to surfaces of fibers forming the woven fabric 5, and the layer has pores 7 is not a cushion layer 1.
  • a cushion material 10 for hot pressing is only required to include at least a cushion layer 1 and may include only a cushion layer 1.
  • a cushion layer 1 of a cushion material 10 for hot pressing may be single-layered or multi-layered.
  • Figure 4 illustrates a cushion material 10a for hot pressing according to another embodiment.
  • surface layers 2 are stacked on surfaces of a cushion layer 1 with bonding layers 3 interposed therebetween.
  • the surface layers 2 are provided mainly for imparting releasability to the cushion material for hot pressing.
  • a material of the surface layers 2 a synthetic resin film, a material to which releasable resin is applied on its a surface side of a base material made of woven fabric, or the like is available. It is particularly preferable to use a material that has dimensional stability during high-temperature use, is free from deformation and adhesion, and has a good releasability for resisting high-temperature pressing.
  • a thickness of the surface layers 2 is preferably set at, for example, 0.1 to 0.5 mm.
  • the bonding layers 3 the same polyimide resin as the material used in the cushion layer 1 is preferably used.
  • Figure 5 illustrates a cushion material 10b for hot pressing according to another embodiment.
  • the cushion material 10b for hot pressing two cushion layers 1 are stacked with a bonding sheet part 4 interposed therebetween.
  • surface layers 2 are stacked with bonding layers 3 interposed therebetween.
  • the cushion layers 1 are each formed by impregnating woven fabric made of glass fiber with resin, there is a limitation on a thickness of the cushion layers 1; however, the configuration in which two cushion layers 1 are stacked in this manner is advantageous in that an overall thickness of the cushion layers 1 can be further increased.
  • the bonding sheet part 4 is a sheet-like bonding layer that is obtained by, for example, applying adhesive to plain woven fabric formed with typical glass fiber yarns 1b.
  • polyimide resin is preferably used as with the material used in the cushion layers 1. Heat-resistant resin may be applied to sides of the produced cushion material for hot pressing so as to prevent fibers from fraying or lint from dropping from the sides.
  • the cushion material for hot pressing may include three or more cushion layers 1.
  • FIG. 6 illustrates a cushion material 10c for hot pressing according to another embodiment.
  • a heat insulating layer 8 is stacked between two cushion layers 1 with bonding sheet parts 4 interposed therebetween.
  • the heat insulating layer 8 has sufficient heat resistance and durability that can be maintained at an operating temperature of the cushion material for hot pressing (e.g., 280°C or more).
  • an operating temperature of the cushion material for hot pressing e.g., 280°C or more
  • surface layers 2 are stacked with bonding layers 3 interposed therebetween. This can improve heat-insulation properties of the cushion material 10c for hot pressing.
  • the heat insulating layer 8 is, for example, a sheet-like article that is obtained by impregnating a base material with inorganic binder.
  • woven fabric or nonwoven fabric made of inorganic fiber may be used.
  • the inorganic fiber include glass fiber, ceramic fiber, alumina fiber, silica fiber, and the like.
  • examples of the inorganic binder include alkylsilane, silica, ceramic, and the like.
  • the cushion material for hot pressing may include three or more cushion layers 1.
  • the heat insulating layer 8 may be obtained by stacking a plurality of heat insulating layers 8 with a bonding layer 3 or a bonding sheet part 4 interposed therebetween.
  • a thickness of the heat insulating layer 8 is preferably set, for example, within the range of 0.8 to 15 mm in accordance with required heat insulating performance.
  • a configuration with one thick heat insulating layer may be disadvantageous from viewpoints of durability and producibility; thus, in a case of a thick heat insulating layer 8, it is preferable to use one obtained by stacking two or more heat insulating layers that are relatively thin (e.g., about 1.0 mm) with a bonding layer 3 or a bonding sheet part 4 interposed therebetween.
  • a total thickness is preferably set within the range of 0.8 to 15 mm.
  • the heat insulating layer 8 bears cushioning properties of the cushion material for hot pressing as with the cushion layer 1. That is, since the heat insulating layer 8 has sufficient heat resistance and durability at the operating temperature (e.g., 280°C or more), the heat insulating layer 8 can maintain sufficient cushioning properties even when used in high-temperature pressing repeatedly, as with the cushion layers 1.
  • the operating temperature e.g., 280°C or more
  • a thickness of the cushion material 10 for hot pressing is denoted by t 0
  • a thickness of the cushion material 10 for hot pressing when the cushion material 10 for hot pressing is compressed under the following pressing test conditions is denoted by t 1
  • (t 0 -t 1 ) can be regarded as a total amount of pores of the cushion layers 1 and the heat insulating layer 8.
  • a total porosity Fn' of the cushion layers 1 and the heat insulating layer 8 can be estimated from a calculated value of "(t 0 - t 1 ) / t 2 '".
  • "(t 0 - t 1 )" can be regarded as an amount of pores of the cushion layers 1 as in the example described above; thus, a cushion material for hot pressing including such a heat insulating layer 8 can be evaluated with Fn described above.
  • the woven fabric in which warp and/or weft is texturized yarns (glass bulked yarns) made of glass fiber is prepared.
  • There is no limit on how to weave the woven fabric and a plain weave, a twill weave, and other known weaves can be adopted.
  • a cushion layer (cushion sheet) 1 can be fabricated by applying polyimide resin varnish having a concentration of 2 to 10% to the woven fabric and drying the woven fabric at a temperature of 150 to 250°C for 3 to 10 minutes, by which the polyimide resin is caused to be adhered to the surfaces of fibers forming the woven fabric.
  • an amount of the adhered resin is preferably set at, for example, 20 to 200 g/m 2 .
  • the amount of the adhered resin can be adjusted by wring out the woven fabric under a pressure of 0.1 to 5 kg/cm 2 with resin rolls, rubber rolls, metal rolls, or the like.
  • the polyimide resin varnish to be applied it is preferable to use a varnish that is formulated by diluting the polyimide resin varnish with a solvent NMP (N-methyl-2-pyrrolidone) so that the polyimide resin varnish has a solid content concentration of 2 to 10% and a viscosity of about 20 to 100 mPa ⁇ s.
  • NMP N-methyl-2-pyrrolidone
  • solution of polyamic acid, which is a precursor of polyimide may be used.
  • the woven fabric in which the polyimide resin is adhered on surfaces of its fibers obtained in this manner brings about a state in which fibers are fixed and covered, and it is possible to maintain shapes of and pores between texturized yarns (bulked yarns) even in high temperature use. As a result, it is possible to keep good cushioning properties even when the woven fabric is used repeatedly.
  • the cushion material for hot pressing includes surface layers (surface layer sheets) 2
  • surface layers 2 that are obtained by, for example, applying polyimide resin to one side of a sheet serving as a base material, then drying the sheet, and then applying polyimide resin to the other side, and then drying the sheet can be used.
  • the cushion material for hot pressing includes a bonding sheet part (bonding sheet) 4
  • a bonding sheet part 4 that is obtained by, for example, applying resin to both sides of a sheet serving as a base material and drying the sheet can be used.
  • the resin is, for example, polyimide resin.
  • the bonding sheet part 4 may be fabricated by applying polyimide resin varnish (with a thickness of 40 to 60 ⁇ m) to a PET film, semi-drying the polyimide resin varnish, and then peeling off the semi-dried polyimide resin varnish from the PET film into a filmy shape.
  • the cushion layer 1 and a plurality of sheet-like articles are stacked (e.g., a surface layer sheet 2, a cushion sheet 1, a bonding sheet 4, a cushion sheet 1, and a surface layer sheet 2 are stacked) and integrated by hot pressing.
  • the cushion material for hot pressing includes a heat insulating layer 8
  • a heat insulating layer 8 that is obtained by, for example, causing alkylsilane binder to be adhered to glass woven fabric prepared as a woven fabric material.
  • the cushion material for hot pressing according to the present invention can be used when press forming or thermocompression bonding is performed in production of laminates such as printed circuit boards, by a method as illustrated in Figure 7 as in conventional practices. That is, by performing hot pressing in a state where cushion materials 11 for hot pressing are interposed between heating platens 13 and a workpiece 12 to be pressed, heat and pressure applied to the workpiece 12 to be pressed can be kept uniform all over the workpiece 12 to be pressed.
  • Examples 1 to 4 and Comparative Example 1 each have a configuration including surface layer sheets and a bonding sheet
  • Comparative Examples 2 to 14 each have a configuration including only a cushion sheet and not including surface layer sheets or a bonding sheet.
  • a double-twill-weave bulky glass woven fabric for which yarns each obtained by twisting two glass yarns (count 67.5 tex) (non-bulked yarns having a single fiber diameter of 5 ⁇ m and the number of single fibers of 2400) were used as its warp and yarns each obtained by twisting four glass yarns (count 67.5 tex) and bulking the twisted glass yarns (texturized yarns having a single fiber diameter of 5 ⁇ m and the number of single fibers of 4800) were used as its weft.
  • a resin material there was prepared a polyimide resin varnish (concentration: 5%) having a decomposition temperature: 512°C and a glass transition temperature: 400°C or more.
  • the glass woven fabric was impregnated with this polyimide resin varnish and then dried at 200°C for 5 minutes, by which cushion sheets in which polyimide resin was adhered to the woven fabric material in a proportion of 1.7% by mass were prepared.
  • surface layer sheets there were prepared surface layer sheets each obtained by applying polyimide resin varnish to one side (surface side) of a plain-weave glass woven fabric, drying the plain-weave glass woven fabric, then applying polyimide resin varnish to the other side (bonding layer), and drying the plain-weave glass woven fabric.
  • a bonding sheet there was prepared a bonding sheet obtained by applying polyimide resin varnish on both sides (bonding layers) of a plain-weave glass woven fabric and drying the plain-weave glass woven fabric.
  • the obtained surface layer sheet, cushion sheet, bonding sheet, cushion sheet, and surface layer sheet were stacked in this order, pressed under conditions: 10 MPa ⁇ 190°C and heating 60 minutes + cooling 10 minutes, and then subjected to heat treatment of 300°C ⁇ 5 hours, by which a sample of a cushion material for hot pressing was obtained.
  • Cushion sheets each obtained by impregnating the same bulky glass woven fabric as that of Example 1 with fluoro rubber in a proportion of 10.5% by mass were prepared.
  • surface layer sheets and a bonding sheet those to which fluoro rubber varnish was adhered in place of the polyimide resin varnish serving as the bonding layers of Example 1 were prepared, with which a sample of a cushion material for hot pressing having the same configuration as that of Example 1.
  • cushion sheets each having an amount of adhered resin in a proportion of 2.8% by mass with respect to a mass of its base material and a thickness of 0.75 mm obtained by causing polyimide resin (the same polyimide resin as that of Example 1) to be adhered to a twill-weave woven fabric having a weave density of warp: 34 yarns / 2.5 cm and weft: 22 yarns / 2.5 cm for which yarns each obtained by twisting four glass yarns (count 67.5 tex) (non-bulked yarns) were used as its warp and yarns each obtained by twisting four glass yarns (count 67.5 tex) (non-bulked yarns) were used as its weft, and drying the twill-weave woven fabric at 230°C ⁇ 5h.
  • Three of these cushion sheets were stacked to obtain a sample of a cushion material for hot pressing.
  • cushion sheets each having an amount of adhered resin in a proportion of 3.1% by mass with respect to a mass of its base material and a thickness of 1.10 mm obtained by causing polyimide resin (the same polyimide resin as that of Example 1) to be adhered to a sateen-weave woven fabric having a weave density of warp: 45 yarns / 2.5 cm and weft: 30 yarns / 2.5 cm for which yarns each obtained by twisting four glass yarns (count 67.5 tex) (non-bulked yarns) were used as its warp and yarns each obtained by twisting four glass yarns (count 67.5 tex) (non-bulked yarns) were used as its weft, and drying the sateen-weave woven fabric at 230°C ⁇ 5 h. Two of these cushion sheets were stacked to obtain a sample of a cushion material for hot pressing.
  • cushion sheets made of a triple-twill-weave woven fabric (thickness: 2.40 mm) having a weave density of warp: 93 yarns / 2.5 cm and weft: 66 yarns / 2.5 cm for which yarns each obtained by twisting two poly-m-phenyleneisophthalamide spun yarns (count 59.1 tex, cotton count: 10) were used as its warp and yarns each obtained by twisting three poly-m-phenyleneisophthalamide spun yarns (count 59.1 tex, cotton count: 10) were used as its weft.
  • a sample of a cushion material for hot pressing formed with one of the cushion sheets was obtained.
  • cushion sheets made of a quadruple-twill-weave woven fabric (thickness: 2.60 mm) having a weave density of warp: 109 yarns / 2.5 cm and weft: 85 yarns / 2.5 cm for which yarns each obtained by twisting two poly-m-phenyleneisophthalamide spun yarns (count 59.1 tex, cotton count: 10) were used as its warp and yarns each obtained by twisting three poly-m-phenyleneisophthalamide spun yarns (count 59.1 tex, cotton count: 10) were used as its weft.
  • a sample of a cushion material for hot pressing formed with one of the cushion sheets was obtained.
  • cushion sheets having a thickness of 0.52 mm made of a twill-weave woven fabric having a weave density of warp: 68 yarns / 2.5 cm and weft: 60 yarns / 2.5 cm for which yarns each obtained by twisting two poly-p-phenylenebenzobisoxazole spun yarns (count 29.5 tex, cotton count: 20) were used as its warp and yarns each obtained by twisting two poly-p-phenylenebenzobisoxazole spun yarns (count 29.5 tex, cotton count: 20) were used as its weft.
  • Four of these cushion sheets were stacked to obtain a sample of a cushion material for hot pressing.
  • cushion sheets each having an amount of adhered resin set in a proportion of 3.3% by mass to a weight of its base material and each obtained by impregnating the woven fabric of Comparative Example 10 with polyimide resin (the same as the polyimide resin of Example 1) and drying the woven fabric at 230°C ⁇ 5 h. Four of these cushion sheets were stacked to obtain a sample of a cushion material for hot pressing.
  • cushion sheets made of nonwoven fabric having a thickness of 4.5 mm obtained by stacking three webs of poly-p-phenylenebenzobisoxazole fiber (fiber: Zylon (R) from TOYOBO CO., LTD.) and two layers of base fabric made of Victoria lawn glass cloth alternately and performing needle-punch.
  • a sample of a cushion material for hot pressing formed with one of the cushion sheets was obtained. Note that a basis weight was set at 1350 g/m 2 (web: 1180 g/m 2 , base fabric: 170 g/m 2 ).
  • cushion sheets made of nonwoven fabric having a thickness of 5.0 mm obtained by performing needle-punch on webs made of SUS fiber.
  • a sample of a cushion material for hot pressing formed with one of the cushion sheets was obtained.
  • Table 1 shows base materials of various types of cushion sheets.
  • Table 2 shows conditions for the various types of cushion sheets.
  • porosities Fn of their cushion layers were determined before pressing and after pressing 1 time, 10 times, 50 times and 100 times. Note that, in this comparative experiment, since a size of samples for the durability test were as small as 200 mm square, the number of positions for taking a sample for evaluating the porosity Fn was determined to be only one: a position away from an edge by 5 cm or more.
  • a thickness t 0 of each sample before the compression under the conditions a thickness t 2 of each cushion layer 1, and a thickness t 1 of each sample during the compression were measured. Note that the thickness t 0 of the sample before the compression was measured at one spot near a center portion of the sample with a dial thickness gauge, and the thickness t 1 during the compression was measured with an autograph precision universal testing machine under the conditions for the pressing test to evaluate the porosity.
  • a cross section of a sample was observed at 50x magnification under a digital microscope (VHX series from Keyence Corporation), and a measurement tool is used to measure a distance between a line that connects two apexes of a fiber (a thread of warp or weft) meandering along the cross section of its cushion sheet that are positioned at an upper edge of the cushion sheet and a line that connects two apexes of the fiber that are positioned at a lower edge of the cushion sheet.
  • a total thickness of the cushion sheets was determined as the thickness t 2 of a cushion layer 1.
  • an average value of the measurement at one spot near a center portion of each side of the sample was determined.
  • Examples 1 to 4 which satisfied the conditions according to the present invention, had good cushioning properties at all the test temperatures. That is, Examples 1 to 4 maintained high porosities after pressing 100 times at all of the test temperatures and had good durability and cushioning properties.
  • Comparative Examples 1 to 14 caused extreme decreases in their thicknesses and cushioning properties after the test performed only once. In particular, in the test at 400°C, Comparative Example 1 caused carbonization of its fluoro rubber, and Comparative Examples 4 to 9 also caused carbonization and degradation of their poly-m-phenyleneisophthalamide fibers; thus, Comparative Example 1 and Comparative Examples 4 to 9 did not have sufficient heat resistance.
  • Comparative Examples 13 and 14 caused significant decreases in their thickness and cushioning properties in the durability test; thus Comparative Examples 13 and 14 failed to provide stable cushioning properties when used repeatedly.
  • the present invention it is possible to provide a cushion material for hot pressing that can maintain good cushioning properties even when used in high-temperature pressing at 280°C or more repeatedly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Proteomics, Peptides & Aminoacids (AREA)
  • Dispersion Chemistry (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Woven Fabrics (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Claims (3)

  1. Polstermaterial (10, 10a, 10b, 10c, 11) zum Heißpressen, umfassend eine Polsterschicht (1), wobei
    die Polsterschicht (1) ein Gewebe (5) umfasst, das aus Fasern gebildet ist,
    die Polsterschicht (1) Poren (7) in ihrem Inneren umfasst, und
    Kette (5a) und/oder Schuss (5b) des Gewebes (5) texturierte Garne aus Glasfasern sind, gekennzeichnet durch Polyimidharz (6), das an den Oberflächen der das Gewebe (5) bildenden Fasern haftet.
  2. Polstermaterial (10, 10a, 10b, 10c, 11) zum Heißpressen nach Anspruch 1, wobei, wenn eine Dicke des Polstermaterials (10, 10a, 10b, 10c, 11) zum Heißpressen mit t0 bezeichnet wird, eine Dicke des Polstermaterials (10, 10a, 10b, 10c, 11) zum Heißpressen, wenn das Polstermaterial (10, 10a, 10b, 10c, 11) zum Heißpressen unter Bedingungen von 25 °C und 10,0 MPa komprimiert wird, mit t1 bezeichnet wird, und eine Dicke der Polsterschicht (1) mit t2 bezeichnet wird, Fn, das aus der folgenden Formel (1) bestimmt wird, 0,20 oder mehr beträgt, wobei die Dicke t0, t1 und t2 gemäß der Beschreibung gemessen werden Fn = t 0 − t 1 / t 2
  3. Polstermaterial (10, 10a, 10b, 10c, 11) zum Heißpressen nach Anspruch 2, wobei Fn, das aus der obigen Formel (1) bestimmt wird, nach einmaligem Pressen unter Bedingungen, dass eine Druckbeaufschlagungsbedingung 4,0 MPa beträgt, 0,20 oder mehr beträgt, eine Temperatur in 30 Minuten von 25 °C auf 300 °C erhöht wird, die Temperatur für 40 Minuten gehalten wird und anschließend eine Wasserkühlung für 30 Minuten durchgeführt wird.
EP21817672.5A 2020-06-03 2021-06-02 Polstermaterial zum heisspressen Active EP4163099B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020097156A JP6790297B1 (ja) 2020-06-03 2020-06-03 熱プレス用クッション材
PCT/JP2021/020978 WO2021246436A1 (ja) 2020-06-03 2021-06-02 熱プレス用クッション材

Publications (4)

Publication Number Publication Date
EP4163099A1 EP4163099A1 (de) 2023-04-12
EP4163099A4 EP4163099A4 (de) 2024-05-22
EP4163099C0 EP4163099C0 (de) 2025-09-03
EP4163099B1 true EP4163099B1 (de) 2025-09-03

Family

ID=73452929

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21817672.5A Active EP4163099B1 (de) 2020-06-03 2021-06-02 Polstermaterial zum heisspressen

Country Status (7)

Country Link
US (1) US20230234315A1 (de)
EP (1) EP4163099B1 (de)
JP (1) JP6790297B1 (de)
KR (1) KR20230019869A (de)
CN (2) CN120816768A (de)
TW (1) TWI775469B (de)
WO (1) WO2021246436A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7591974B2 (ja) * 2021-05-24 2024-11-29 株式会社日本製鋼所 積層成形プレス装置、積層成形システム、および積層成形方法
JP7098200B1 (ja) * 2021-11-16 2022-07-11 ヤマウチ株式会社 熱プレス用クッション材
JP7442164B2 (ja) * 2021-11-16 2024-03-04 ヤマウチ株式会社 熱プレス用クッション材

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0673688A (ja) * 1992-08-10 1994-03-15 Yamauchi Corp 成形プレス用クッション材
TW524749B (en) * 1999-09-17 2003-03-21 Ichikawa Co Ltd Heat resistant cushion material for forming press
JP4183558B2 (ja) * 2003-05-26 2008-11-19 ヤマウチ株式会社 熱プレス用シート
JP2006123510A (ja) * 2004-09-29 2006-05-18 Yamauchi Corp プレス成形用クッション材およびその製造方法
JP4746523B2 (ja) * 2006-11-28 2011-08-10 ヤマウチ株式会社 熱プレス用クッション材およびその製造方法
JP5685063B2 (ja) * 2010-11-26 2015-03-18 ヤマウチ株式会社 熱プレス用クッション材
WO2012169011A1 (ja) * 2011-06-07 2012-12-13 ヤマウチ株式会社 クッション材用表層材および熱プレス用クッション材
JP5820024B1 (ja) * 2014-06-30 2015-11-24 ヤマウチ株式会社 熱プレス用クッション材及びその製造方法
JP6894344B2 (ja) * 2016-10-28 2021-06-30 三ツ星ベルト株式会社 熱プレス用クッション材
WO2019163159A1 (ja) * 2018-02-22 2019-08-29 日東紡績株式会社 ガラスクロス、プリプレグ、及び、ガラス繊維強化樹脂成形品
CN108770203B (zh) * 2018-05-23 2021-04-09 昆山市柳鑫电子有限公司 一种印刷电路板热压用缓冲垫及其制备方法
JP7140381B2 (ja) * 2018-10-09 2022-09-21 ヤマウチ株式会社 熱プレス用クッション材および熱プレス用クッション材の製造方法

Also Published As

Publication number Publication date
KR20230019869A (ko) 2023-02-09
TW202206291A (zh) 2022-02-16
WO2021246436A1 (ja) 2021-12-09
US20230234315A1 (en) 2023-07-27
EP4163099A1 (de) 2023-04-12
CN115916518B (zh) 2025-12-12
TWI775469B (zh) 2022-08-21
JP6790297B1 (ja) 2020-11-25
CN120816768A (zh) 2025-10-21
JP2021186851A (ja) 2021-12-13
EP4163099C0 (de) 2025-09-03
CN115916518A (zh) 2023-04-04
EP4163099A4 (de) 2024-05-22

Similar Documents

Publication Publication Date Title
EP2098350B1 (de) Polstermaterial für wärmepresse und herstellungsverfahren dafür
EP4163099A1 (de) Polstermaterial zum heisspressen
US5626916A (en) Cloth prepreg, process for producing the same and reinforcing fabric
KR101179835B1 (ko) 열 프레스용 쿠션재 및 적층판의 제조 방법
EP2679619B1 (de) Faserverstärktes verbundmaterial
EP2719513B1 (de) Oberflächenschichtstoff für polstermaterial und polstermaterial für heisspressung
EP3162527A1 (de) Dämpfungsmaterial für warmwalze und herstellungsverfahren dafür
EP2065109A2 (de) Kohlenstofffasern enthaltender laminierter formkörper und herstellungsverfahren dafür
EP3865274B1 (de) Polstermaterial für heisspresse und verfahren zur herstellung von polstermaterial für eine heisspresse
JP7442164B2 (ja) 熱プレス用クッション材
EP4435161A1 (de) Heissgepresstes polstermaterial
JP2005281871A (ja) 炭素繊維織物及びその製造方法
JP2004031159A (ja) 編織物からなる燃料電池ガス拡散層基材及びその製造方法

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20221214

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
A4 Supplementary search report drawn up and despatched

Effective date: 20240424

RIC1 Information provided on ipc code assigned before grant

Ipc: D06M 15/59 20060101ALI20240418BHEP

Ipc: B29C 43/34 20060101ALI20240418BHEP

Ipc: D03D 15/267 20210101ALI20240418BHEP

Ipc: D03D 11/00 20060101ALI20240418BHEP

Ipc: D03D 1/00 20060101ALI20240418BHEP

Ipc: B30B 15/02 20060101AFI20240418BHEP

REG Reference to a national code

Ref country code: DE

Ref legal event code: R079

Free format text: PREVIOUS MAIN CLASS: B30B0015020000

Ipc: B29C0043320000

Ref document number: 602021037912

Country of ref document: DE

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

RIC1 Information provided on ipc code assigned before grant

Ipc: D06N 3/12 20060101ALI20250401BHEP

Ipc: D06M 15/59 20060101ALI20250401BHEP

Ipc: D03D 15/49 20210101ALI20250401BHEP

Ipc: D03D 15/267 20210101ALI20250401BHEP

Ipc: D03D 11/00 20060101ALI20250401BHEP

Ipc: D03D 7/00 20060101ALI20250401BHEP

Ipc: D03D 1/00 20060101ALI20250401BHEP

Ipc: B30B 15/06 20060101ALI20250401BHEP

Ipc: B29C 43/36 20060101ALI20250401BHEP

Ipc: B29C 43/32 20060101AFI20250401BHEP

INTG Intention to grant announced

Effective date: 20250414

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602021037912

Country of ref document: DE

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

U01 Request for unitary effect filed

Effective date: 20250930

U07 Unitary effect registered

Designated state(s): AT BE BG DE DK EE FI FR IT LT LU LV MT NL PT RO SE SI

Effective date: 20251010

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20251203

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20250903

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20251204

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20250903

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20251203

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20250903

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20250903

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20260103

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20250903

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20250903

U1N Appointed representative for the unitary patent procedure changed after the registration of the unitary effect

Representative=s name: MARKS & CLERK LLP; GB